8x+20=5x+32 7x-80=5x-20 86+4x=108-x 解方程

8x+20=5x+32
8x-5x=32-20
3x=12
x=4
7x-80=5x-20
7x-5x=80-20
2x=60
x=30
86+4x=108-x
4x+x=108-86
5x=22
x=4.4

4
30
4.4

8x+20=5x+32
8x-5x=32-20
3x=12
x=12÷3
x=4
7x-80=5x-20
7x-5x=80-20
2x=60
x=30
86+4x=108-x
4x+x=108-86
5x=22
x=22÷5
x=4.4
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8x+20=5x+32
3x=12
x=4
7x-80=5x-20
2x=60
x=30
86+4x=108-x
5x=22
x=4.4

8x+20=5x+32
8x-5x=32-20
3x=12
x=4
7x-80=5x-20
7x-5x=-20+80
2x=60
x=30
86+4x=108-x
4x+x=108-86
5x=22
x=4.4

①8x+20=5x+32
3x=12 x=4
②7x-80=5x-20
2x=60 x=30
③86+4x=108-x
5x=22 x=4.4

8x+20=5x+32
3x=12
x=4
7x-80=5x-20
2x=60
x=30
86+4x=108-x
5x=22
x=4.4

1、X=4
2、X=30
3、X=4.4